#include "apue.h"

Sigfunc * signal_intr(int signo, Sigfunc *func)
{
	struct sigaction act, oact;

	act.sa_handler = func;
	sigemptyset(&act.sa_mask);
	act.sa_flags = 0;
#ifdef SA_INTERRUPT
	act.sa_flags |= SA_INTERRUPT;
#endif
	if(sigaction(signo, &act, &oact) < 0)
		return SIG_ERR;
	return oact.sa_handler;
}
